1961191646 has 16 divisors (see below), whose sum is σ = 3075127200. Its totient is φ = 936300288.

The previous prime is 1961191637. The next prime is 1961191649. The reversal of 1961191646 is 6461911691.

It is a junction number, because it is equal to n+sod(n) for n = 1961191597 and 1961191606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1961191649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11291 + ... + 63638.

It is an arithmetic number, because the mean of its divisors is an integer number (192195450).

Almost surely, 2^1961191646 is an apocalyptic number.

1961191646 is a deficient number, since it is larger than the sum of its proper divisors (1113935554).

1961191646 is a wasteful number, since it uses less digits than its factorization.

1961191646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75523.

The product of its digits is 69984, while the sum is 44.

The square root of 1961191646 is about 44285.3434671111. The cubic root of 1961191646 is about 1251.7185207464.

The spelling of 1961191646 in words is "one billion, nine hundred sixty-one million, one hundred ninety-one thousand, six hundred forty-six".